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-rw-r--r--src/expr/CMakeLists.txt2
-rw-r--r--src/expr/proof_step_buffer.cpp109
-rw-r--r--src/expr/proof_step_buffer.h96
3 files changed, 207 insertions, 0 deletions
diff --git a/src/expr/CMakeLists.txt b/src/expr/CMakeLists.txt
index 413041213..3d41b7a72 100644
--- a/src/expr/CMakeLists.txt
+++ b/src/expr/CMakeLists.txt
@@ -51,6 +51,8 @@ libcvc4_add_sources(
proof_rule.h
proof_skolem_cache.cpp
proof_skolem_cache.h
+ proof_step_buffer.cpp
+ proof_step_buffer.h
symbol_table.cpp
symbol_table.h
term_canonize.cpp
diff --git a/src/expr/proof_step_buffer.cpp b/src/expr/proof_step_buffer.cpp
new file mode 100644
index 000000000..800efa2c0
--- /dev/null
+++ b/src/expr/proof_step_buffer.cpp
@@ -0,0 +1,109 @@
+/********************* */
+/*! \file proof_step_buffer.cpp
+ ** \verbatim
+ ** Top contributors (to current version):
+ ** Andrew Reynolds
+ ** This file is part of the CVC4 project.
+ ** Copyright (c) 2009-2019 by the authors listed in the file AUTHORS
+ ** in the top-level source directory) and their institutional affiliations.
+ ** All rights reserved. See the file COPYING in the top-level source
+ ** directory for licensing information.\endverbatim
+ **
+ ** \brief Implementation of proof step and proof step buffer utilities.
+ **/
+
+#include "expr/proof_step_buffer.h"
+
+using namespace CVC4::kind;
+
+namespace CVC4 {
+
+ProofStep::ProofStep() : d_rule(PfRule::UNKNOWN) {}
+ProofStep::ProofStep(PfRule r,
+ const std::vector<Node>& children,
+ const std::vector<Node>& args)
+ : d_rule(r), d_children(children), d_args(args)
+{
+}
+std::ostream& operator<<(std::ostream& out, ProofStep step)
+{
+ out << "(step " << step.d_rule;
+ for (const Node& c : step.d_children)
+ {
+ out << " " << c;
+ }
+ if (!step.d_args.empty())
+ {
+ out << " :args";
+ for (const Node& a : step.d_args)
+ {
+ out << " " << a;
+ }
+ }
+ out << ")";
+ return out;
+}
+
+ProofStepBuffer::ProofStepBuffer(ProofChecker* pc) : d_checker(pc) {}
+
+Node ProofStepBuffer::tryStep(PfRule id,
+ const std::vector<Node>& children,
+ const std::vector<Node>& args,
+ Node expected)
+{
+ if (d_checker == nullptr)
+ {
+ Assert(false) << "ProofStepBuffer::ProofStepBuffer: no proof checker.";
+ return Node::null();
+ }
+ Node res =
+ d_checker->checkDebug(id, children, args, expected, "pf-step-buffer");
+ if (!res.isNull())
+ {
+ // add proof step
+ d_steps.push_back(
+ std::pair<Node, ProofStep>(res, ProofStep(id, children, args)));
+ }
+ return res;
+}
+
+void ProofStepBuffer::addStep(PfRule id,
+ const std::vector<Node>& children,
+ const std::vector<Node>& args,
+ Node expected)
+{
+ d_steps.push_back(
+ std::pair<Node, ProofStep>(expected, ProofStep(id, children, args)));
+}
+
+void ProofStepBuffer::addSteps(ProofStepBuffer& psb)
+{
+ const std::vector<std::pair<Node, ProofStep>>& steps = psb.getSteps();
+ for (const std::pair<Node, ProofStep>& step : steps)
+ {
+ addStep(step.second.d_rule,
+ step.second.d_children,
+ step.second.d_args,
+ step.first);
+ }
+}
+
+void ProofStepBuffer::popStep()
+{
+ Assert(!d_steps.empty());
+ if (!d_steps.empty())
+ {
+ d_steps.pop_back();
+ }
+}
+
+size_t ProofStepBuffer::getNumSteps() const { return d_steps.size(); }
+
+const std::vector<std::pair<Node, ProofStep>>& ProofStepBuffer::getSteps() const
+{
+ return d_steps;
+}
+
+void ProofStepBuffer::clear() { d_steps.clear(); }
+
+} // namespace CVC4
diff --git a/src/expr/proof_step_buffer.h b/src/expr/proof_step_buffer.h
new file mode 100644
index 000000000..005aee399
--- /dev/null
+++ b/src/expr/proof_step_buffer.h
@@ -0,0 +1,96 @@
+/********************* */
+/*! \file proof_step_buffer.h
+ ** \verbatim
+ ** Top contributors (to current version):
+ ** Andrew Reynolds
+ ** This file is part of the CVC4 project.
+ ** Copyright (c) 2009-2019 by the authors listed in the file AUTHORS
+ ** in the top-level source directory) and their institutional affiliations.
+ ** All rights reserved. See the file COPYING in the top-level source
+ ** directory for licensing information.\endverbatim
+ **
+ ** \brief Proof step and proof step buffer utilities.
+ **/
+
+#include "cvc4_private.h"
+
+#ifndef CVC4__EXPR__PROOF_STEP_BUFFER_H
+#define CVC4__EXPR__PROOF_STEP_BUFFER_H
+
+#include <vector>
+
+#include "expr/node.h"
+#include "expr/proof_checker.h"
+#include "expr/proof_rule.h"
+
+namespace CVC4 {
+
+/**
+ * Information for constructing a step in a CDProof. Notice that the conclusion
+ * of the proof step is intentionally not included in this data structure.
+ * Instead, it is intended that conclusions may be associated with proof steps
+ * based on e.g. the result of proof checking.
+ */
+class ProofStep
+{
+ public:
+ ProofStep();
+ ProofStep(PfRule r,
+ const std::vector<Node>& children,
+ const std::vector<Node>& args);
+ /** The proof rule */
+ PfRule d_rule;
+ /** The proof children */
+ std::vector<Node> d_children;
+ /** The proof arguments */
+ std::vector<Node> d_args;
+};
+std::ostream& operator<<(std::ostream& out, ProofStep step);
+
+/**
+ * Class used to speculatively try and buffer a set of proof steps before
+ * sending them to a proof object.
+ */
+class ProofStepBuffer
+{
+ public:
+ ProofStepBuffer(ProofChecker* pc = nullptr);
+ ~ProofStepBuffer() {}
+ /**
+ * Returns the conclusion of the proof step, as determined by the proof
+ * checker of the given proof. If this is non-null, then the given step
+ * is added to the buffer maintained by this class.
+ *
+ * If expected is non-null, then this method returns null if the result of
+ * checking is not equal to expected.
+ */
+ Node tryStep(PfRule id,
+ const std::vector<Node>& children,
+ const std::vector<Node>& args,
+ Node expected = Node::null());
+ /** Same as above, without checking */
+ void addStep(PfRule id,
+ const std::vector<Node>& children,
+ const std::vector<Node>& args,
+ Node expected);
+ /** Multi-step version */
+ void addSteps(ProofStepBuffer& psb);
+ /** pop step */
+ void popStep();
+ /** Get num steps */
+ size_t getNumSteps() const;
+ /** Get steps */
+ const std::vector<std::pair<Node, ProofStep>>& getSteps() const;
+ /** Clear */
+ void clear();
+
+ private:
+ /** The proof checker*/
+ ProofChecker* d_checker;
+ /** the queued proof steps */
+ std::vector<std::pair<Node, ProofStep>> d_steps;
+};
+
+} // namespace CVC4
+
+#endif /* CVC4__EXPR__PROOF_STEP_BUFFER_H */
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